Third London attacker said to have been flagged to United Kingdom police

The youngest of the attackers, an Italian national of Moroccan descent, he was allowed to enter the United Kingdom and had been living in east London.

Born in Fez, Morocco, in January 1995, Youssef Zaghba is the son of a Moroccan naturalised Italian and an Italian woman who converted to Islam.

An Italian intelligence source said Zaghba's Italian mother lives in the northern Italian city of Bologna.

The other confirmed victims of Saturday's three-man attack are 32-year-old British web entrepreneur James McMullan, 21-year-old Australian au pair Sara Zelenak, 28-year old Australian nurse Kirsty Boden and 30-year-old former homeless shelter worker Christine Archibald, a Canadian. Seven civilians were killed in the attack and dozens more were injured.

The trio drove a van from London Bridge into pedestrians then got out and began stabbing people in an attack that left seven people dead and 48 injured. Police later shot the three assailants dead.

Two men were arrested on a street in Ilford and the third was apprehended at an Ilford residence when police searched the home, authorities said.

The married father-of-two, who worked for London Underground as a trainee customer services assistant for almost six months previous year, could be seen in the programme arguing with police officers in the street, after displaying a flag used by so-called Islamic State in a London park. His mother was said to have told police previous year that he had asked her for money to travel to Rome before he left on his attempted trip to Syria.

When May called the election in April, her Conservatives led in opinion polls by 20 points or more. He has said cuts in the number of police officers have had an impact on the ability to prevent attacks.

"We are paying a heavy cost in these attacks", Macron said. In particular, there are questions over whether investigators had the resources to look into complaints such as those levelled by Butt's neighbours about his attempts to radicalize children and whether crucial opportunities were missed.